Errata

Packet Guide to Voice over IP

Errata for Packet Guide to Voice over IP

Submit your own errata for this product.

The errata list is a list of errors and their corrections that were found after the product was released. If the error was corrected in a later version or reprint the date of the correction will be displayed in the column titled "Date Corrected".

The following errata were submitted by our customers and approved as valid errors by the author or editor.

Color key: Serious technical mistake Minor technical mistake Language or formatting error Typo Question Note Update

Version Location Description Submitted By Date submitted Date corrected
Printed
Page 17
Table 1-1

PoE voltage specifications are in the 40 to 50 volt range not 10 to 20 volt range.

Also in the third column you have the minimum current as 176mA. This would make the minimum current higher than the maximum current stated in the next column.

Note from the Author or Editor:
Correct - we missed a decimal point there. Should be 17.6 in this table.

 Jason Baird  Mar 19, 2014 
Printed, PDF, Mobi
Page 54
First paragraph under T-1 signaling

The sentence which reads:
"For example, in ISDN, all of the signaling may be sent via one of the 24 frames."
is incorrect.

A frame is a single sample from each of the 24 DS0s. ISDN uses one of the 24 CHANNELS to send signaling. As written the sentence is confusing to readers who are unfamiliar with T-1 framing and how channels are formed.

Note from the Author or Editor:
True - this is an editing oops. Definitely should be "channel".

 John Hart  Jul 14, 2014 
Printed
Page 180
bottom paragraph

(224-1) does not match circled values for statusDeterminationNumber

Note from the Author or Editor:
Hmmm, looks like a reference to some xml code or some such wasn't edited out.

 marc lalonde  Feb 24, 2015 
Printed
Page 201
figure 7-12

Figure 7-12 says "updated topology" but nothing is changed compared to 7-2.

Note from the Author or Editor:
This is an error - figure 7-2 should not have the addresses or phone numbers.

 marc lalonde  Feb 25, 2015 
Printed
Page 215
bottom paragraph

original phones are ephone1 and ephone 2

Note from the Author or Editor:
Correct - these should be ephone 1 and 2.

 marc lalonde  Feb 24, 2015